WTF is the problem? - Ford Powerstroke Diesel Forum
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Old 04-14-2011, 05:59 AM
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WTF is the problem?

A month ago my HPOP went bad, I replaced it and now a month later on my way home the truck started running like crap and had the same symptoms, so I replaced it again but that didn't fix the problem. After I got it running again it sounded like the back 2cyl on the passenger side weren't firing. Checked the UVCH plugs, they're all good. Tried to rev the truck up, you can smash it to the floor and it takes about 5 sencods to rev up then when you try to hold it steady it slowly drops rpm until it dies. It acts like it's loosing oil pressure to the injectors and they won't fire. So, I assumed that the LPOP was going out and wasn't supplying oil to the HPOP. Replaced that, which didn't fix the problem. So far I've replaced the HPOP, LPOP, ICP sensor, IPR sensor, and it still doesn't run I'm at a loss here. I don't know where to check next.
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Old 04-14-2011, 06:38 AM
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Have you got a spare IDM or PCM you can try?
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Old 04-14-2011, 06:41 AM
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Have you hooked it up to a scanner? That would be the first thing I would do. For all you know it could just be a 30 dollar CPS.
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Old 04-14-2011, 10:10 AM
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I've got a scanner and it's not throwing codes. And I've tried 3 different CPS sensors on it already. I've got another PCM I can try tonight, and if that doesn't fix it I could probably trck down an IDM.
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Old 04-16-2011, 03:58 AM
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Did you figure out what was wrong? I have the same truck and it has the same problem.
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Old 04-16-2011, 04:19 AM
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I did not read any test having to do with fuel. That would be my next series of test.
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Old 04-18-2011, 05:28 AM
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Replaced the IDM and got it going. When it first started running it had a really loud knock in one of the back pass side cylinders, then stopped knocking after a minute or so. Also found one of the UVCH plugs burned up which I over looked when I checked them (it was dark the first time). Repaired that plug and started driving it. It ran alright but still isn't right. That was thursday night, and being as this is my only transportation, I've been driving it sense then and it has progressivly gotten worse.

Now it is running, but not on all 8 cylinders, shakes horribly at idle and pretty much over the entire RPM range. Has NO power at all. won't build over 8-10psi of boost. and it blows white smoke non stop. It's kind of a haze when crusing on the highway around 2000 RPM and when taking off its a huge white cloud. Also, fuel mileage has went down the drain, I have driven roughly 100 miles sense thursday and it has already used a whole tank of fuel.
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Old 04-19-2011, 11:31 AM
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Also, crank case is full of diesel.
I'm thinking a stuck injector?
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Old 04-20-2011, 04:50 PM
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or injector cup. if thats the case injector or not i'd stop driving it. fuel in the crank case thats obviously noticeable is no good...... serious issue.
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Old 04-21-2011, 05:53 AM
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Maybe I wasn't thinking right injector cups separate fuel and coolant I think?????
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